The sequestration of trace hexafluoropropylene(C_(3)F_(6))is a critical yet formidable task in the production of high-purity perfluoropropane(C_(3)F_(8)),an important perfluorinated electronic specialty gas(F-gas)in t...The sequestration of trace hexafluoropropylene(C_(3)F_(6))is a critical yet formidable task in the production of high-purity perfluoropropane(C_(3)F_(8)),an important perfluorinated electronic specialty gas(F-gas)in the advanced electronics industry.Traditional adsorbents struggle with uneven,low-pressure uptake and compromises in selectivity.This work utilizes aperture size-electrostatic potential matching within a robust metal–organic framework(Al-PMA)to facilitate selective,reversible binding of C_(3)F_(6)while excluding larger C_(3)F_(8)molecules.The presence of bridging hydroxyl groups(μ_(2)-OH)in Al-PMA creates positive electrostatic potential traps that securely anchor C_(3)F_(6)through strong hydrogen bonding,evidenced by insitu infrared and^(19)F magic angle spinning nuclear magnetic resonance spectroscopy.Breakthrough experiments demonstrate the efficient removal of trace C_(3)F_(6)from C_(3)F_(8)under ambient conditions,achieving C_(3)F_(8)purity exceeding 99.999%.The scalability of Al-PMA synthesis,remarkable stability,and exceptional performance highlight its potential as a promising adsorbent for industrial C_(3)F_(6)/C_(3)F_(8)separations.展开更多
The ＇abnormally＇ high electrical conductivity ofpure water was recently studied by us using our protonic bond, trap and energy band model, with five host particles： the positive and negative protons, and the amphot...The ＇abnormally＇ high electrical conductivity ofpure water was recently studied by us using our protonic bond, trap and energy band model, with five host particles： the positive and negative protons, and the amphoteric protonic trap in three charge states, positive, neutral and negative. Our second report described the electrical charge storage capacitance of pure and impure water. This third report presents the theory of particle density and electrical conductance of pure and impure water, including the impuritons, which consist of an impurity ion bonded to a proton, proton-hole or proton trap and which significantly affect impure waters＇ properties.展开更多
基金supported by the National Natural Science Foundation of China(22225802,22288102,22141001,and 21878260)Zhejiang Provincial Natural Science Foundation of China(LZ22B060002 and LQ22B060005)Zhejiang Provincial Innovation Center of Advanced Chemicals Technology(2024SJCZX0020)。
文摘The sequestration of trace hexafluoropropylene(C_(3)F_(6))is a critical yet formidable task in the production of high-purity perfluoropropane(C_(3)F_(8)),an important perfluorinated electronic specialty gas(F-gas)in the advanced electronics industry.Traditional adsorbents struggle with uneven,low-pressure uptake and compromises in selectivity.This work utilizes aperture size-electrostatic potential matching within a robust metal–organic framework(Al-PMA)to facilitate selective,reversible binding of C_(3)F_(6)while excluding larger C_(3)F_(8)molecules.The presence of bridging hydroxyl groups(μ_(2)-OH)in Al-PMA creates positive electrostatic potential traps that securely anchor C_(3)F_(6)through strong hydrogen bonding,evidenced by insitu infrared and^(19)F magic angle spinning nuclear magnetic resonance spectroscopy.Breakthrough experiments demonstrate the efficient removal of trace C_(3)F_(6)from C_(3)F_(8)under ambient conditions,achieving C_(3)F_(8)purity exceeding 99.999%.The scalability of Al-PMA synthesis,remarkable stability,and exceptional performance highlight its potential as a promising adsorbent for industrial C_(3)F_(6)/C_(3)F_(8)separations.
文摘The ＇abnormally＇ high electrical conductivity ofpure water was recently studied by us using our protonic bond, trap and energy band model, with five host particles： the positive and negative protons, and the amphoteric protonic trap in three charge states, positive, neutral and negative. Our second report described the electrical charge storage capacitance of pure and impure water. This third report presents the theory of particle density and electrical conductance of pure and impure water, including the impuritons, which consist of an impurity ion bonded to a proton, proton-hole or proton trap and which significantly affect impure waters＇ properties.
